Hello, I am trying to fix the monitor LG L1951s that does not power on, I found the 68uF*450V capacitor bad, replaced this one but problem ramains. I have measured most of the componets on the power board and they seem to be fine; however for some reason after the high frequency transformer (secondary) on the power supply, I do not get any voltaje and the FAN7601 which is a current mode PWM controller it does not have voltaje either, this IC seems to be fed by the secondary of this transformer too , could be the transformer the one that is damaged? or is there is something else I need to check?, I would really appreciate some inputs on the solutions, thanks

Hello Mehboob, you could send a photo of the component and if you do not have it, comment on which diagram you are in
I hope you answer
Greetings Franco Dosil

Hola Mehboob, podr?as mandar una foto del componente y si es que no lo tienes, comentar en que diagrama se encuentra
Espero te respuesta
Saludos Franco Dosil

The fault to your TV might not due to a defective capacitor. A higher capacitance valued capacitor, won't do nothing wrong. But as the capacitance value increases, the size of the capacitor will too increase. That's all. Check the fuse at the power supply regulator board. If it is found opened, make sure that something wrong with the power supply regulator board. Without rectifying the fault, never replace a fuse, as it will make things worse. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window.

It depends on the tolerance rating of the capacitor, but usually 8uf is withing tolerance

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed LG and other monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://en.wikipedia.org/wiki/Capacitor_plague

Learn about bad caps: Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Does it stay on when you plug it in IF the serial cable is not connected? Ours would come on and display "connect cable"...then when we did, it would shut off. Turns out it had a bad capacitor on the power board. Cost $1.25 to replace the part.

Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, falied inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

power supply has blown. you need to replace the bad capacitors on it. common problem

Look at the power supply first; look for burnt parts, bad capacitors, etc. Look for 5vdc, 12vdc..
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find

Hello,

It sounds like you have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of he monitor. If you are good at electronics repair/soldering you can usually fix he problem. Check out a few pictures on my web site www.ccl-la.com/badcaps.htm You can take the back cover off your monitor and look for the bad parts,replace any that look like the pictures and your monitor should work fine. The capacitors do need to be installed with the correct + and - connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $35 plus shipping.

I hope this helps, if so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com
Over 21 years of computer and printer support/repair

I C Power PA192D Model 900G, Mfg Sep '05 19inch LCD
I purchased this monitor at Goodwill not working for $20. The 900G power light failed to come on and there was no video when turned on. To fix, first pull the 2 screws at the bottom of the back side of the monitor_ note this face is NOT removed by prying with a screwdriver like other monitors, it IS removed by sliding the face plate Upwards. Remove the LCD screws and remove the wires to the backlights carefully noting what goes where. Remove the metal cover and remove the 110volt power board. I found smoke trails under the cover and a swollen 470uf25v capacitor number C206, and replaced C110, C211 all were 470uf. Reassembled and found no change. Tore down again, used the ESR meter CapAnalyzer 88a and found C114 47uf25v to be 30% working, the volt ohm showed the cap to be good, that's why the ESR meter was needed. Replaced the 47uf25v C114, tested the large 100uf 450v capacitor, it tested only slightly under spec , could not find a 100uf at Radio Shack so did not replace it. So in this attempt the only thing changed was the 47uf C114. Reassembled and now works perfectly.

i'm not an expert at anything...x'cept maybe dumpster diving. God Bless